摘要
为定量研究华北落叶松人工林水分利用特征,2010年5-10月在宁夏六盘山北侧叠叠沟林场的华北落叶松人工林固定样地内,通过测定树干径向生长、林分叶面积指数变化、草本生物量变化、树干液流速率变化、植物降雨截持等,估计了华北落叶松人工林及各层的生产力、水分消耗和水分利用效率。研究表明:林分总生产力11.76t/hm2,其中乔木层占75.2%,草本层占24.8%;在整个生长期内,林分生产力各月的分量呈现先升高后降低的季节变化格局。林分总蒸散量为433.9mm,其中乔木层与草本层(包括土壤蒸发)耗水各约占一半,分别为总蒸散的50.5%和49.5%;林分蒸散在生长季中呈现先升高后降低的季节变化格局。在整个生长季,华北落叶松人工林的水分利用效率为2.71g/kg,其中乔木层的水分利用效率为4.04g/kg,草本层水分利用效率为1.36g/kg;其季节变化与乔木层的水分利用效率变化相类似,说明乔木层对于华北落叶松林分水分利用效率的影响较大。
In order to quantitatively study the characteristics of water use of Larix principis-rupprechtii plantation,from May to October in 2010,tree radial growth,leaf area index,the increment in herb biomass,sap flow,interception of trees and so on were simultaneously measured and to be used to estimate the productivity,water consumption and water use efficiency（WUE） of L.principis-rupprechtii plantation,which was located in the Diediegou catchment in the northern Liupan Mountains,Ningxia Hui Autonomous Region.The results showed that the total productivity of the plantation was 11.76 t/hm2.The productivity of canopy layer accounted for 75.2% of the total,while the productivity of herb layer accounted for 24.8%.In the growing season,the total productivity increased in the early-and mid-season and then decreased in the late season.Total evapotranspiration of the plantation was 433.9 mm,and the water consumption in tree canopy and herbaceous layer（including soil evaporation） accounts for 50.5% and 49.5% of the total evapotranspiration,respectively.And the evapotranspiration followed a temporal change pattern which was high in the early season and low in the late season.Throughout the growing season,WUE of L.principis-rupprechtii plantation was 2.71 g/kg,and WUE of tree layer was 4.04 g/kg,while WUE of herbaceous layer was 1.36 g/kg.The seasonal change of WUE in the whole plantation was similar to that of tree layer,suggesting that the tree layer has a strong influence on the determining WUE in the plantation.
出处
《水土保持研究》
CSCD
北大核心
2011年第5期112-118,123,共8页
Research of Soil and Water Conservation
基金
中国林业科学研究院森林生态环境与保护研究所基本科研业务费专项资金项目(CAFRIFEEP200905)
林业公益性行业科研专项经费(200904056
201104005-02)
国家"十二五"科技计划课题(2011BAD38B05)
国家自然科学基金(40730631
30671677
40801017
41071023)
关键词
华北落叶松
人工林
水分利用效率
生产力
蒸散
Larix principis-rupprechtii
plantation
water use efficiency
productivity
evapotranspiration
